/*!
 * Viewer.js v1.9.0
 * https://fengyuanchen.github.io/viewerjs
 *
 * Copyright 2015-present Chen Fengyuan
 * Released under the MIT license
 *
 * Date: 2020-12-06T11:25:15.688Z
 */

(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
    typeof define === 'function' && define.amd ? define(factory) :
    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.Viewer = factory());
  }(this, (function () { 'use strict';

    function _typeof(obj) {
      "@babel/helpers - typeof";

      if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
        _typeof = function (obj) {
          return typeof obj;
        };
      } else {
        _typeof = function (obj) {
          return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
        };
      }

      return _typeof(obj);
    }

    function _classCallCheck(instance, Constructor) {
      if (!(instance instanceof Constructor)) {
        throw new TypeError("Cannot call a class as a function");
      }
    }

    function _defineProperties(target, props) {
      for (var i = 0; i < props.length; i++) {
        var descriptor = props[i];
        descriptor.enumerable = descriptor.enumerable || false;
        descriptor.configurable = true;
        if ("value" in descriptor) descriptor.writable = true;
        Object.defineProperty(target, descriptor.key, descriptor);
      }
    }

    function _createClass(Constructor, protoProps, staticProps) {
      if (protoProps) _defineProperties(Constructor.prototype, protoProps);
      if (staticProps) _defineProperties(Constructor, staticProps);
      return Constructor;
    }

    function _defineProperty(obj, key, value) {
      if (key in obj) {
        Object.defineProperty(obj, key, {
          value: value,
          enumerable: true,
          configurable: true,
          writable: true
        });
      } else {
        obj[key] = value;
      }

      return obj;
    }

    function ownKeys(object, enumerableOnly) {
      var keys = Object.keys(object);

      if (Object.getOwnPropertySymbols) {
        var symbols = Object.getOwnPropertySymbols(object);
        if (enumerableOnly) symbols = symbols.filter(function (sym) {
          return Object.getOwnPropertyDescriptor(object, sym).enumerable;
        });
        keys.push.apply(keys, symbols);
      }

      return keys;
    }

    function _objectSpread2(target) {
      for (var i = 1; i < arguments.length; i++) {
        var source = arguments[i] != null ? arguments[i] : {};

        if (i % 2) {
          ownKeys(Object(source), true).forEach(function (key) {
            _defineProperty(target, key, source[key]);
          });
        } else if (Object.getOwnPropertyDescriptors) {
          Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
        } else {
          ownKeys(Object(source)).forEach(function (key) {
            Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
          });
        }
      }

      return target;
    }

    var DEFAULTS = {
      /**
       * Enable a modal backdrop, specify `static` for a backdrop
       * which doesn't close the modal on click.
       * @type {boolean}
       */
      backdrop: true,

      /**
       * Show the button on the top-right of the viewer.
       * @type {boolean}
       */
      button: true,

      /**
       * Show the navbar.
       * @type {boolean | number}
       */
      navbar: true,

      /**
       * Specify the visibility and the content of the title.
       * @type {boolean | number | Function | Array}
       */
      title: true,

      /**
       * Show the toolbar.
       * @type {boolean | number | Object}
       */
      toolbar: true,

      /**
       * Custom class name(s) to add to the viewer's root element.
       * @type {string}
       */
      className: '',

      /**
       * Define where to put the viewer in modal mode.
       * @type {string | Element}
       */
      container: 'body',

      /**
       * Filter the images for viewing. Return true if the image is viewable.
       * @type {Function}
       */
      filter: null,

      /**
       * Enable to request fullscreen when play.
       * @type {boolean}
       */
      fullscreen: true,

      /**
       * Define the extra attributes to inherit from the original image.
       * @type {Array}
       */
      inheritedAttributes: ['crossOrigin', 'decoding', 'isMap', 'loading', 'referrerPolicy', 'sizes', 'srcset', 'useMap'],

      /**
       * Define the initial index of image for viewing.
       * @type {number}
       */
      initialViewIndex: 0,

      /**
       * Enable inline mode.
       * @type {boolean}
       */
      inline: false,

      /**
       * The amount of time to delay between automatically cycling an image when playing.
       * @type {number}
       */
      interval: 5000,

      /**
       * Enable keyboard support.
       * @type {boolean}
       */
      keyboard: true,

      /**
       * Focus the viewer when initialized.
       * @type {boolean}
       */
      focus: true,

      /**
       * Indicate if show a loading spinner when load image or not.
       * @type {boolean}
       */
      loading: true,

      /**
       * Indicate if enable loop viewing or not.
       * @type {boolean}
       */
      loop: true,

      /**
       * Min width of the viewer in inline mode.
       * @type {number}
       */
      minWidth: 200,

      /**
       * Min height of the viewer in inline mode.
       * @type {number}
       */
      minHeight: 100,

      /**
       * Enable to move the image.
       * @type {boolean}
       */
      movable: true,

      /**
       * Enable to rotate the image.
       * @type {boolean}
       */
      rotatable: true,

      /**
       * Enable to scale the image.
       * @type {boolean}
       */
      scalable: true,

      /**
       * Enable to zoom the image.
       * @type {boolean}
       */
      zoomable: true,

      /**
       * Enable to zoom the current image by dragging on the touch screen.
       * @type {boolean}
       */
      zoomOnTouch: true,

      /**
       * Enable to zoom the image by wheeling mouse.
       * @type {boolean}
       */
      zoomOnWheel: true,

      /**
       * Enable to slide to the next or previous image by swiping on the touch screen.
       * @type {boolean}
       */
      slideOnTouch: true,

      /**
       * Indicate if toggle the image size between its natural size
       * and initial size when double click on the image or not.
       * @type {boolean}
       */
      toggleOnDblclick: true,

      /**
       * Show the tooltip with image ratio (percentage) when zoom in or zoom out.
       * @type {boolean}
       */
      tooltip: true,

      /**
       * Enable CSS3 Transition for some special elements.
       * @type {boolean}
       */
      transition: true,

      /**
       * Define the CSS `z-index` value of viewer in modal mode.
       * @type {number}
       */
      zIndex: 2015,

      /**
       * Define the CSS `z-index` value of viewer in inline mode.
       * @type {number}
       */
      zIndexInline: 0,

      /**
       * Define the ratio when zoom the image by wheeling mouse.
       * @type {number}
       */
      zoomRatio: 0.1,

      /**
       * Define the min ratio of the image when zoom out.
       * @type {number}
       */
      minZoomRatio: 0.01,

      /**
       * Define the max ratio of the image when zoom in.
       * @type {number}
       */
      maxZoomRatio: 100,

      /**
       * Define where to get the original image URL for viewing.
       * @type {string | Function}
       */
      url: 'src',

      /**
       * Event shortcuts.
       * @type {Function}
       */
      ready: null,
      show: null,
      shown: null,
      hide: null,
      hidden: null,
      view: null,
      viewed: null,
      move: null,
      moved: null,
      rotate: null,
      rotated: null,
      scale: null,
      scaled: null,
      zoom: null,
      zoomed: null,
      play: null,
      stop: null
    };

    var TEMPLATE = '<div class="viewer-container" tabindex="-1" touch-action="none">' + '<div class="viewer-canvas"></div>' + '<div class="viewer-footer">' + '<div class="viewer-title"></div>' + '<div class="viewer-toolbar"></div>' + '<div class="viewer-navbar">' + '<ul class="viewer-list" role="navigation"></ul>' + '</div>' + '</div>' + '<div class="viewer-tooltip" role="alert" aria-hidden="true"></div>' + '<div class="viewer-button" data-viewer-action="mix" role="button"></div>' + '<div class="viewer-player"></div>' + '</div>';

    var IS_BROWSER = typeof window !== 'undefined' && typeof window.document !== 'undefined';
    var WINDOW = IS_BROWSER ? window : {};
    var IS_TOUCH_DEVICE = IS_BROWSER && WINDOW.document.documentElement ? 'ontouchstart' in WINDOW.document.documentElement : false;
    var HAS_POINTER_EVENT = IS_BROWSER ? 'PointerEvent' in WINDOW : false;
    var NAMESPACE = 'viewer'; // Actions

    var ACTION_MOVE = 'move';
    var ACTION_SWITCH = 'switch';
    var ACTION_ZOOM = 'zoom'; // Classes

    var CLASS_ACTIVE = "".concat(NAMESPACE, "-active");
    var CLASS_CLOSE = "".concat(NAMESPACE, "-close");
    var CLASS_FADE = "".concat(NAMESPACE, "-fade");
    var CLASS_FIXED = "".concat(NAMESPACE, "-fixed");
    var CLASS_FULLSCREEN = "".concat(NAMESPACE, "-fullscreen");
    var CLASS_FULLSCREEN_EXIT = "".concat(NAMESPACE, "-fullscreen-exit");
    var CLASS_HIDE = "".concat(NAMESPACE, "-hide");
    var CLASS_HIDE_MD_DOWN = "".concat(NAMESPACE, "-hide-md-down");
    var CLASS_HIDE_SM_DOWN = "".concat(NAMESPACE, "-hide-sm-down");
    var CLASS_HIDE_XS_DOWN = "".concat(NAMESPACE, "-hide-xs-down");
    var CLASS_IN = "".concat(NAMESPACE, "-in");
    var CLASS_INVISIBLE = "".concat(NAMESPACE, "-invisible");
    var CLASS_LOADING = "".concat(NAMESPACE, "-loading");
    var CLASS_MOVE = "".concat(NAMESPACE, "-move");
    var CLASS_OPEN = "".concat(NAMESPACE, "-open");
    var CLASS_SHOW = "".concat(NAMESPACE, "-show");
    var CLASS_TRANSITION = "".concat(NAMESPACE, "-transition"); // Native events

    var EVENT_CLICK = 'click';
    var EVENT_DBLCLICK = 'dblclick';
    var EVENT_DRAG_START = 'dragstart';
    var EVENT_FOCUSIN = 'focusin';
    var EVENT_KEY_DOWN = 'keydown';
    var EVENT_LOAD = 'load';
    var EVENT_TOUCH_END = IS_TOUCH_DEVICE ? 'touchend touchcancel' : 'mouseup';
    var EVENT_TOUCH_MOVE = IS_TOUCH_DEVICE ? 'touchmove' : 'mousemove';
    var EVENT_TOUCH_START = IS_TOUCH_DEVICE ? 'touchstart' : 'mousedown';
    var EVENT_POINTER_DOWN = HAS_POINTER_EVENT ? 'pointerdown' : EVENT_TOUCH_START;
    var EVENT_POINTER_MOVE = HAS_POINTER_EVENT ? 'pointermove' : EVENT_TOUCH_MOVE;
    var EVENT_POINTER_UP = HAS_POINTER_EVENT ? 'pointerup pointercancel' : EVENT_TOUCH_END;
    var EVENT_RESIZE = 'resize';
    var EVENT_TRANSITION_END = 'transitionend';
    var EVENT_WHEEL = 'wheel'; // Custom events

    var EVENT_READY = 'ready';
    var EVENT_SHOW = 'show';
    var EVENT_SHOWN = 'shown';
    var EVENT_HIDE = 'hide';
    var EVENT_HIDDEN = 'hidden';
    var EVENT_VIEW = 'view';
    var EVENT_VIEWED = 'viewed';
    var EVENT_MOVE = 'move';
    var EVENT_MOVED = 'moved';
    var EVENT_ROTATE = 'rotate';
    var EVENT_ROTATED = 'rotated';
    var EVENT_SCALE = 'scale';
    var EVENT_SCALED = 'scaled';
    var EVENT_ZOOM = 'zoom';
    var EVENT_ZOOMED = 'zoomed';
    var EVENT_PLAY = 'play';
    var EVENT_STOP = 'stop'; // Data keys

    var DATA_ACTION = "".concat(NAMESPACE, "Action"); // RegExps

    var REGEXP_SPACES = /\s\s*/; // Misc

    var BUTTONS = ['zoom-in', 'zoom-out', 'one-to-one', 'reset', 'prev', 'play', 'next', 'rotate-left', 'rotate-right', 'flip-horizontal', 'flip-vertical'];

    /**
     * Check if the given value is a string.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a string, else `false`.
     */

    function isString(value) {
      return typeof value === 'string';
    }
    /**
     * Check if the given value is not a number.
     */

    var isNaN = Number.isNaN || WINDOW.isNaN;
    /**
     * Check if the given value is a number.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a number, else `false`.
     */

    function isNumber(value) {
      return typeof value === 'number' && !isNaN(value);
    }
    /**
     * Check if the given value is undefined.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is undefined, else `false`.
     */

    function isUndefined(value) {
      return typeof value === 'undefined';
    }
    /**
     * Check if the given value is an object.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is an object, else `false`.
     */

    function isObject(value) {
      return _typeof(value) === 'object' && value !== null;
    }
    var hasOwnProperty = Object.prototype.hasOwnProperty;
    /**
     * Check if the given value is a plain object.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a plain object, else `false`.
     */

    function isPlainObject(value) {
      if (!isObject(value)) {
        return false;
      }

      try {
        var _constructor = value.constructor;
        var prototype = _constructor.prototype;
        return _constructor && prototype && hasOwnProperty.call(prototype, 'isPrototypeOf');
      } catch (error) {
        return false;
      }
    }
    /**
     * Check if the given value is a function.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a function, else `false`.
     */

    function isFunction(value) {
      return typeof value === 'function';
    }
    /**
     * Iterate the given data.
     * @param {*} data - The data to iterate.
     * @param {Function} callback - The process function for each element.
     * @returns {*} The original data.
     */

    function forEach(data, callback) {
      if (data && isFunction(callback)) {
        if (Array.isArray(data) || isNumber(data.length)
        /* array-like */
        ) {
            var length = data.length;
            var i;

            for (i = 0; i < length; i += 1) {
              if (callback.call(data, data[i], i, data) === false) {
                break;
              }
            }
          } else if (isObject(data)) {
          Object.keys(data).forEach(function (key) {
            callback.call(data, data[key], key, data);
          });
        }
      }

      return data;
    }
    /**
     * Extend the given object.
     * @param {*} obj - The object to be extended.
     * @param {*} args - The rest objects which will be merged to the first object.
     * @returns {Object} The extended object.
     */

    var assign = Object.assign || function assign(obj) {
      for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
        args[_key - 1] = arguments[_key];
      }

      if (isObject(obj) && args.length > 0) {
        args.forEach(function (arg) {
          if (isObject(arg)) {
            Object.keys(arg).forEach(function (key) {
              obj[key] = arg[key];
            });
          }
        });
      }

      return obj;
    };
    var REGEXP_SUFFIX = /^(?:width|height|left|top|marginLeft|marginTop)$/;
    /**
     * Apply styles to the given element.
     * @param {Element} element - The target element.
     * @param {Object} styles - The styles for applying.
     */

    function setStyle(element, styles) {
      var style = element.style;
      forEach(styles, function (value, property) {
        if (REGEXP_SUFFIX.test(property) && isNumber(value)) {
          value += 'px';
        }

        style[property] = value;
      });
    }
    /**
     * Escape a string for using in HTML.
     * @param {String} value - The string to escape.
     * @returns {String} Returns the escaped string.
     */

    function escapeHTMLEntities(value) {
      return isString(value) ? value.replace(/&(?!amp;|quot;|#39;|lt;|gt;)/g, '&amp;').replace(/"/g, '&quot;').replace(/'/g, '&#39;').replace(/</g, '&lt;').replace(/>/g, '&gt;') : value;
    }
    /**
     * Check if the given element has a special class.
     * @param {Element} element - The element to check.
     * @param {string} value - The class to search.
     * @returns {boolean} Returns `true` if the special class was found.
     */

    function hasClass(element, value) {
      if (!element || !value) {
        return false;
      }

      return element.classList ? element.classList.contains(value) : element.className.indexOf(value) > -1;
    }
    /**
     * Add classes to the given element.
     * @param {Element} element - The target element.
     * @param {string} value - The classes to be added.
     */

    function addClass(element, value) {
      if (!element || !value) {
        return;
      }

      if (isNumber(element.length)) {
        forEach(element, function (elem) {
          addClass(elem, value);
        });
        return;
      }

      if (element.classList) {
        element.classList.add(value);
        return;
      }

      var className = element.className.trim();

      if (!className) {
        element.className = value;
      } else if (className.indexOf(value) < 0) {
        element.className = "".concat(className, " ").concat(value);
      }
    }
    /**
     * Remove classes from the given element.
     * @param {Element} element - The target element.
     * @param {string} value - The classes to be removed.
     */

    function removeClass(element, value) {
      if (!element || !value) {
        return;
      }

      if (isNumber(element.length)) {
        forEach(element, function (elem) {
          removeClass(elem, value);
        });
        return;
      }

      if (element.classList) {
        element.classList.remove(value);
        return;
      }

      if (element.className.indexOf(value) >= 0) {
        element.className = element.className.replace(value, '');
      }
    }
    /**
     * Add or remove classes from the given element.
     * @param {Element} element - The target element.
     * @param {string} value - The classes to be toggled.
     * @param {boolean} added - Add only.
     */

    function toggleClass(element, value, added) {
      if (!value) {
        return;
      }

      if (isNumber(element.length)) {
        forEach(element, function (elem) {
          toggleClass(elem, value, added);
        });
        return;
      } // IE10-11 doesn't support the second parameter of `classList.toggle`


      if (added) {
        addClass(element, value);
      } else {
        removeClass(element, value);
      }
    }
    var REGEXP_HYPHENATE = /([a-z\d])([A-Z])/g;
    /**
     * Transform the given string from camelCase to kebab-case
     * @param {string} value - The value to transform.
     * @returns {string} The transformed value.
     */

    function hyphenate(value) {
      return value.replace(REGEXP_HYPHENATE, '$1-$2').toLowerCase();
    }
    /**
     * Get data from the given element.
     * @param {Element} element - The target element.
     * @param {string} name - The data key to get.
     * @returns {string} The data value.
     */

    function getData(element, name) {
      if (isObject(element[name])) {
        return element[name];
      }

      if (element.dataset) {
        return element.dataset[name];
      }

      return element.getAttribute("data-".concat(hyphenate(name)));
    }
    /**
     * Set data to the given element.
     * @param {Element} element - The target element.
     * @param {string} name - The data key to set.
     * @param {string} data - The data value.
     */

    function setData(element, name, data) {
      if (isObject(data)) {
        element[name] = data;
      } else if (element.dataset) {
        element.dataset[name] = data;
      } else {
        element.setAttribute("data-".concat(hyphenate(name)), data);
      }
    }

    var onceSupported = function () {
      var supported = false;

      if (IS_BROWSER) {
        var once = false;

        var listener = function listener() {};

        var options = Object.defineProperty({}, 'once', {
          get: function get() {
            supported = true;
            return once;
          },

          /**
           * This setter can fix a `TypeError` in strict mode
           * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Getter_only}
           * @param {boolean} value - The value to set
           */
          set: function set(value) {
            once = value;
          }
        });
        WINDOW.addEventListener('test', listener, options);
        WINDOW.removeEventListener('test', listener, options);
      }

      return supported;
    }();
    /**
     * Remove event listener from the target element.
     * @param {Element} element - The event target.
     * @param {string} type - The event type(s).
     * @param {Function} listener - The event listener.
     * @param {Object} options - The event options.
     */


    function removeListener(element, type, listener) {
      var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
      var handler = listener;
      type.trim().split(REGEXP_SPACES).forEach(function (event) {
        if (!onceSupported) {
          var listeners = element.listeners;

          if (listeners && listeners[event] && listeners[event][listener]) {
            handler = listeners[event][listener];
            delete listeners[event][listener];

            if (Object.keys(listeners[event]).length === 0) {
              delete listeners[event];
            }

            if (Object.keys(listeners).length === 0) {
              delete element.listeners;
            }
          }
        }

        element.removeEventListener(event, handler, options);
      });
    }
    /**
     * Add event listener to the target element.
     * @param {Element} element - The event target.
     * @param {string} type - The event type(s).
     * @param {Function} listener - The event listener.
     * @param {Object} options - The event options.
     */

    function addListener(element, type, listener) {
      var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
      var _handler = listener;
      type.trim().split(REGEXP_SPACES).forEach(function (event) {
        if (options.once && !onceSupported) {
          var _element$listeners = element.listeners,
              listeners = _element$listeners === void 0 ? {} : _element$listeners;

          _handler = function handler() {
            delete listeners[event][listener];
            element.removeEventListener(event, _handler, options);

            for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
              args[_key2] = arguments[_key2];
            }

            listener.apply(element, args);
          };

          if (!listeners[event]) {
            listeners[event] = {};
          }

          if (listeners[event][listener]) {
            element.removeEventListener(event, listeners[event][listener], options);
          }

          listeners[event][listener] = _handler;
          element.listeners = listeners;
        }

        element.addEventListener(event, _handler, options);
      });
    }
    /**
     * Dispatch event on the target element.
     * @param {Element} element - The event target.
     * @param {string} type - The event type(s).
     * @param {Object} data - The additional event data.
     * @param {Object} options - The additional event options.
     * @returns {boolean} Indicate if the event is default prevented or not.
     */

    function dispatchEvent(element, type, data, options) {
      var event; // Event and CustomEvent on IE9-11 are global objects, not constructors

      if (isFunction(Event) && isFunction(CustomEvent)) {
        event = new CustomEvent(type, _objectSpread2({
          bubbles: true,
          cancelable: true,
          detail: data
        }, options));
      } else {
        event = document.createEvent('CustomEvent');
        event.initCustomEvent(type, true, true, data);
      }

      return element.dispatchEvent(event);
    }
    /**
     * Get the offset base on the document.
     * @param {Element} element - The target element.
     * @returns {Object} The offset data.
     */

    function getOffset(element) {
      var box = element.getBoundingClientRect();
      return {
        left: box.left + (window.pageXOffset - document.documentElement.clientLeft),
        top: box.top + (window.pageYOffset - document.documentElement.clientTop)
      };
    }
    /**
     * Get transforms base on the given object.
     * @param {Object} obj - The target object.
     * @returns {string} A string contains transform values.
     */

    function getTransforms(_ref) {
      var rotate = _ref.rotate,
          scaleX = _ref.scaleX,
          scaleY = _ref.scaleY,
          translateX = _ref.translateX,
          translateY = _ref.translateY;
      var values = [];

      if (isNumber(translateX) && translateX !== 0) {
        values.push("translateX(".concat(translateX, "px)"));
      }

      if (isNumber(translateY) && translateY !== 0) {
        values.push("translateY(".concat(translateY, "px)"));
      } // Rotate should come first before scale to match orientation transform


      if (isNumber(rotate) && rotate !== 0) {
        values.push("rotate(".concat(rotate, "deg)"));
      }

      if (isNumber(scaleX) && scaleX !== 1) {
        values.push("scaleX(".concat(scaleX, ")"));
      }

      if (isNumber(scaleY) && scaleY !== 1) {
        values.push("scaleY(".concat(scaleY, ")"));
      }

      var transform = values.length ? values.join(' ') : 'none';
      return {
        WebkitTransform: transform,
        msTransform: transform,
        transform: transform
      };
    }
    /**
     * Get an image name from an image url.
     * @param {string} url - The target url.
     * @example
     * // picture.jpg
     * getImageNameFromURL('https://domain.com/path/to/picture.jpg?size=1280×960')
     * @returns {string} A string contains the image name.
     */

    function getImageNameFromURL(url) {
      return isString(url) ? decodeURIComponent(url.replace(/^.*\//, '').replace(/[?&#].*$/, '')) : '';
    }
    var IS_SAFARI = WINDOW.navigator && /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i.test(WINDOW.navigator.userAgent);
    /**
     * Get an image's natural sizes.
     * @param {string} image - The target image.
     * @param {Object} options - The viewer options.
     * @param {Function} callback - The callback function.
     * @returns {HTMLImageElement} The new image.
     */

    function getImageNaturalSizes(image, options, callback) {
      var newImage = document.createElement('img'); // Modern browsers (except Safari)

      if (image.naturalWidth && !IS_SAFARI) {
        callback(image.naturalWidth, image.naturalHeight);
        return newImage;
      }

      var body = document.body || document.documentElement;

      newImage.onload = function () {
        callback(newImage.width, newImage.height);

        if (!IS_SAFARI) {
          body.removeChild(newImage);
        }
      };

      forEach(options.inheritedAttributes, function (name) {
        var value = image.getAttribute(name);

        if (value !== null) {
          newImage.setAttribute(name, value);
        }
      });
      newImage.src = image.src; // iOS Safari will convert the image automatically
      // with its orientation once append it into DOM

      if (!IS_SAFARI) {
        newImage.style.cssText = 'left:0;' + 'max-height:none!important;' + 'max-width:none!important;' + 'min-height:0!important;' + 'min-width:0!important;' + 'opacity:0;' + 'position:absolute;' + 'top:0;' + 'z-index:-1;';
        body.appendChild(newImage);
      }

      return newImage;
    }
    /**
     * Get the related class name of a responsive type number.
     * @param {string} type - The responsive type.
     * @returns {string} The related class name.
     */

    function getResponsiveClass(type) {
      switch (type) {
        case 2:
          return CLASS_HIDE_XS_DOWN;

        case 3:
          return CLASS_HIDE_SM_DOWN;

        case 4:
          return CLASS_HIDE_MD_DOWN;

        default:
          return '';
      }
    }
    /**
     * Get the max ratio of a group of pointers.
     * @param {string} pointers - The target pointers.
     * @returns {number} The result ratio.
     */

    function getMaxZoomRatio(pointers) {
      var pointers2 = _objectSpread2({}, pointers);

      var ratios = [];
      forEach(pointers, function (pointer, pointerId) {
        delete pointers2[pointerId];
        forEach(pointers2, function (pointer2) {
          var x1 = Math.abs(pointer.startX - pointer2.startX);
          var y1 = Math.abs(pointer.startY - pointer2.startY);
          var x2 = Math.abs(pointer.endX - pointer2.endX);
          var y2 = Math.abs(pointer.endY - pointer2.endY);
          var z1 = Math.sqrt(x1 * x1 + y1 * y1);
          var z2 = Math.sqrt(x2 * x2 + y2 * y2);
          var ratio = (z2 - z1) / z1;
          ratios.push(ratio);
        });
      });
      ratios.sort(function (a, b) {
        return Math.abs(a) < Math.abs(b);
      });
      return ratios[0];
    }
    /**
     * Get a pointer from an event object.
     * @param {Object} event - The target event object.
     * @param {boolean} endOnly - Indicates if only returns the end point coordinate or not.
     * @returns {Object} The result pointer contains start and/or end point coordinates.
     */

    function getPointer(_ref2, endOnly) {
      var pageX = _ref2.pageX,
          pageY = _ref2.pageY;
      var end = {
        endX: pageX,
        endY: pageY
      };
      return endOnly ? end : _objectSpread2({
        timeStamp: Date.now(),
        startX: pageX,
        startY: pageY
      }, end);
    }
    /**
     * Get the center point coordinate of a group of pointers.
     * @param {Object} pointers - The target pointers.
     * @returns {Object} The center point coordinate.
     */

    function getPointersCenter(pointers) {
      var pageX = 0;
      var pageY = 0;
      var count = 0;
      forEach(pointers, function (_ref3) {
        var startX = _ref3.startX,
            startY = _ref3.startY;
        pageX += startX;
        pageY += startY;
        count += 1;
      });
      pageX /= count;
      pageY /= count;
      return {
        pageX: pageX,
        pageY: pageY
      };
    }

    var render = {
      render: function render() {
        this.initContainer();
        this.initViewer();
        this.initList();
        this.renderViewer();
      },
      initBody: function initBody() {
        var ownerDocument = this.element.ownerDocument;
        var body = ownerDocument.body || ownerDocument.documentElement;
        this.body = body;
        this.scrollbarWidth = window.innerWidth - ownerDocument.documentElement.clientWidth;
        this.initialBodyPaddingRight = body.style.paddingRight;
        this.initialBodyComputedPaddingRight = window.getComputedStyle(body).paddingRight;
      },
      initContainer: function initContainer() {
        this.containerData = {
          width: window.innerWidth,
          height: window.innerHeight
        };
      },
      initViewer: function initViewer() {
        var options = this.options,
            parent = this.parent;
        var viewerData;

        if (options.inline) {
          viewerData = {
            width: Math.max(parent.offsetWidth, options.minWidth),
            height: Math.max(parent.offsetHeight, options.minHeight)
          };
          this.parentData = viewerData;
        }

        if (this.fulled || !viewerData) {
          viewerData = this.containerData;
        }

        this.viewerData = assign({}, viewerData);
      },
      renderViewer: function renderViewer() {
        if (this.options.inline && !this.fulled) {
          setStyle(this.viewer, this.viewerData);
        }
      },
      initList: function initList() {
        var _this = this;

        var element = this.element,
            options = this.options,
            list = this.list;
        var items = []; // initList may be called in this.update, so should keep idempotent

        list.innerHTML = '';
        forEach(this.images, function (image, index) {
          var src = image.src;
          var alt = image.alt || getImageNameFromURL(src);

          var url = _this.getImageURL(image);

          if (src || url) {
            var item = document.createElement('li');
            var img = document.createElement('img');
            forEach(options.inheritedAttributes, function (name) {
              var value = image.getAttribute(name);

              if (value !== null) {
                img.setAttribute(name, value);
              }
            });
            img.src = src || url;
            img.alt = alt;
            img.setAttribute('data-original-url', url || src);
            item.setAttribute('data-index', index);
            item.setAttribute('data-viewer-action', 'view');
            item.setAttribute('role', 'button');

            if (options.keyboard) {
              item.setAttribute('tabindex', 0);
            }

            item.appendChild(img);
            list.appendChild(item);
            items.push(item);
          }
        });
        this.items = items;
        forEach(items, function (item) {
          var image = item.firstElementChild;
          setData(image, 'filled', true);

          if (options.loading) {
            addClass(item, CLASS_LOADING);
          }

          addListener(image, EVENT_LOAD, function (event) {
            if (options.loading) {
              removeClass(item, CLASS_LOADING);
            }

            _this.loadImage(event);
          }, {
            once: true
          });
        });

        if (options.transition) {
          addListener(element, EVENT_VIEWED, function () {
            addClass(list, CLASS_TRANSITION);
          }, {
            once: true
          });
        }
      },
      renderList: function renderList(index) {
        var i = index || this.index;
        var width = this.items[i].offsetWidth || 30;
        var outerWidth = width + 1; // 1 pixel of `margin-left` width
        // Place the active item in the center of the screen

        setStyle(this.list, assign({
          width: outerWidth * this.length
        }, getTransforms({
          translateX: (this.viewerData.width - width) / 2 - outerWidth * i
        })));
      },
      resetList: function resetList() {
        var list = this.list;
        list.innerHTML = '';
        removeClass(list, CLASS_TRANSITION);
        setStyle(list, getTransforms({
          translateX: 0
        }));
      },
      initImage: function initImage(done) {
        var _this2 = this;

        var options = this.options,
            image = this.image,
            viewerData = this.viewerData;
        var footerHeight = this.footer.offsetHeight;
        var viewerWidth = viewerData.width;
        var viewerHeight = Math.max(viewerData.height - footerHeight, footerHeight);
        var oldImageData = this.imageData || {};
        var sizingImage;
        this.imageInitializing = {
          abort: function abort() {
            sizingImage.onload = null;
          }
        };
        sizingImage = getImageNaturalSizes(image, options, function (naturalWidth, naturalHeight) {
          var aspectRatio = naturalWidth / naturalHeight;
          var width = viewerWidth;
          var height = viewerHeight;
          _this2.imageInitializing = false;

          if (viewerHeight * aspectRatio > viewerWidth) {
            height = viewerWidth / aspectRatio;
          } else {
            width = viewerHeight * aspectRatio;
          }

          width = Math.min(width * 0.9, naturalWidth);
          height = Math.min(height * 0.9, naturalHeight);
          var left = (viewerWidth - width) / 2;
          var top = (viewerHeight - height) / 2;
          var imageData = {
            left: left,
            top: top,
            x: left,
            y: top,
            width: width,
            height: height,
            ratio: width / naturalWidth,
            aspectRatio: aspectRatio,
            naturalWidth: naturalWidth,
            naturalHeight: naturalHeight
          };
          var initialImageData = assign({}, imageData);

          if (options.rotatable) {
            imageData.rotate = oldImageData.rotate || 0;
            initialImageData.rotate = 0;
          }

          if (options.scalable) {
            imageData.scaleX = oldImageData.scaleX || 1;
            imageData.scaleY = oldImageData.scaleY || 1;
            initialImageData.scaleX = 1;
            initialImageData.scaleY = 1;
          }

          _this2.imageData = imageData;
          _this2.initialImageData = initialImageData;

          if (done) {
            done();
          }
        });
      },
      renderImage: function renderImage(done) {
        var _this3 = this;

        var image = this.image,
            imageData = this.imageData;
        setStyle(image, assign({
          width: imageData.width,
          height: imageData.height,
          // XXX: Not to use translateX/Y to avoid image shaking when zooming
          marginLeft: imageData.x,
          marginTop: imageData.y
        }, getTransforms(imageData)));

        if (done) {
          if ((this.viewing || this.moving || this.rotating || this.scaling || this.zooming) && this.options.transition && hasClass(image, CLASS_TRANSITION)) {
            var onTransitionEnd = function onTransitionEnd() {
              _this3.imageRendering = false;
              done();
            };

            this.imageRendering = {
              abort: function abort() {
                removeListener(image, EVENT_TRANSITION_END, onTransitionEnd);
              }
            };
            addListener(image, EVENT_TRANSITION_END, onTransitionEnd, {
              once: true
            });
          } else {
            done();
          }
        }
      },
      resetImage: function resetImage() {
        // this.image only defined after viewed
        if (this.viewing || this.viewed) {
          var image = this.image;

          if (this.viewing) {
            this.viewing.abort();
          }

          image.parentNode.removeChild(image);
          this.image = null;
        }
      }
    };

    var events = {
      bind: function bind() {
        var options = this.options,
            viewer = this.viewer,
            canvas = this.canvas;
        var document = this.element.ownerDocument;
        addListener(viewer, EVENT_CLICK, this.onClick = this.click.bind(this));
        addListener(viewer, EVENT_DRAG_START, this.onDragStart = this.dragstart.bind(this));
        addListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown = this.pointerdown.bind(this));
        addListener(document, EVENT_POINTER_MOVE, this.onPointerMove = this.pointermove.bind(this));
        addListener(document, EVENT_POINTER_UP, this.onPointerUp = this.pointerup.bind(this));
        addListener(document, EVENT_KEY_DOWN, this.onKeyDown = this.keydown.bind(this));
        addListener(window, EVENT_RESIZE, this.onResize = this.resize.bind(this));

        if (options.zoomable && options.zoomOnWheel) {
          addListener(viewer, EVENT_WHEEL, this.onWheel = this.wheel.bind(this), {
            passive: false,
            capture: true
          });
        }

        if (options.toggleOnDblclick) {
          addListener(canvas, EVENT_DBLCLICK, this.onDblclick = this.dblclick.bind(this));
        }
      },
      unbind: function unbind() {
        var options = this.options,
            viewer = this.viewer,
            canvas = this.canvas;
        var document = this.element.ownerDocument;
        removeListener(viewer, EVENT_CLICK, this.onClick);
        removeListener(viewer, EVENT_DRAG_START, this.onDragStart);
        removeListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown);
        removeListener(document, EVENT_POINTER_MOVE, this.onPointerMove);
        removeListener(document, EVENT_POINTER_UP, this.onPointerUp);
        removeListener(document, EVENT_KEY_DOWN, this.onKeyDown);
        removeListener(window, EVENT_RESIZE, this.onResize);

        if (options.zoomable && options.zoomOnWheel) {
          removeListener(viewer, EVENT_WHEEL, this.onWheel, {
            passive: false,
            capture: true
          });
        }

        if (options.toggleOnDblclick) {
          removeListener(canvas, EVENT_DBLCLICK, this.onDblclick);
        }
      }
    };

    var handlers = {
      click: function click(event) {
        var options = this.options,
            imageData = this.imageData;
        var target = event.target;
        var action = getData(target, DATA_ACTION);

        if (!action && target.localName === 'img' && target.parentElement.localName === 'li') {
          target = target.parentElement;
          action = getData(target, DATA_ACTION);
        } // Cancel the emulated click when the native click event was triggered.


        if (IS_TOUCH_DEVICE && event.isTrusted && target === this.canvas) {
          clearTimeout(this.clickCanvasTimeout);
        }

        switch (action) {
          case 'mix':
            if (this.played) {
              this.stop();
            } else if (options.inline) {
              if (this.fulled) {
                this.exit();
              } else {
                this.full();
              }
            } else {
              this.hide();
            }

            break;

          case 'hide':
            this.hide();
            break;

          case 'view':
            this.view(getData(target, 'index'));
            break;

          case 'zoom-in':
            this.zoom(0.1, true);
            break;

          case 'zoom-out':
            this.zoom(-0.1, true);
            break;

          case 'one-to-one':
            this.toggle();
            break;

          case 'reset':
            this.reset();
            break;

          case 'prev':
            this.prev(options.loop);
            break;

          case 'play':
            this.play(options.fullscreen);
            break;

          case 'next':
            this.next(options.loop);
            break;

          case 'rotate-left':
            this.rotate(-90);
            break;

          case 'rotate-right':
            this.rotate(90);
            break;

          case 'flip-horizontal':
            this.scaleX(-imageData.scaleX || -1);
            break;

          case 'flip-vertical':
            this.scaleY(-imageData.scaleY || -1);
            break;

          default:
            if (this.played) {
              this.stop();
            }

        }
      },
      dblclick: function dblclick(event) {
        event.preventDefault();

        if (this.viewed && event.target === this.image) {
          // Cancel the emulated double click when the native dblclick event was triggered.
          if (IS_TOUCH_DEVICE && event.isTrusted) {
            clearTimeout(this.doubleClickImageTimeout);
          }

          this.toggle();
        }
      },
      load: function load() {
        var _this = this;

        if (this.timeout) {
          clearTimeout(this.timeout);
          this.timeout = false;
        }

        var element = this.element,
            options = this.options,
            image = this.image,
            index = this.index,
            viewerData = this.viewerData;
        removeClass(image, CLASS_INVISIBLE);

        if (options.loading) {
          removeClass(this.canvas, CLASS_LOADING);
        }

        image.style.cssText = 'height:0;' + "margin-left:".concat(viewerData.width / 2, "px;") + "margin-top:".concat(viewerData.height / 2, "px;") + 'max-width:none!important;' + 'position:absolute;' + 'width:0;';
        this.initImage(function () {
          toggleClass(image, CLASS_MOVE, options.movable);
          toggleClass(image, CLASS_TRANSITION, options.transition);

          _this.renderImage(function () {
            _this.viewed = true;
            _this.viewing = false;

            if (isFunction(options.viewed)) {
              addListener(element, EVENT_VIEWED, options.viewed, {
                once: true
              });
            }

            dispatchEvent(element, EVENT_VIEWED, {
              originalImage: _this.images[index],
              index: index,
              image: image
            }, {
              cancelable: false
            });
          });
        });
      },
      loadImage: function loadImage(event) {
        var image = event.target;
        var parent = image.parentNode;
        var parentWidth = parent.offsetWidth || 30;
        var parentHeight = parent.offsetHeight || 50;
        var filled = !!getData(image, 'filled');
        getImageNaturalSizes(image, this.options, function (naturalWidth, naturalHeight) {
          var aspectRatio = naturalWidth / naturalHeight;
          var width = parentWidth;
          var height = parentHeight;

          if (parentHeight * aspectRatio > parentWidth) {
            if (filled) {
              width = parentHeight * aspectRatio;
            } else {
              height = parentWidth / aspectRatio;
            }
          } else if (filled) {
            height = parentWidth / aspectRatio;
          } else {
            width = parentHeight * aspectRatio;
          }

          setStyle(image, assign({
            width: width,
            height: height
          }, getTransforms({
            translateX: (parentWidth - width) / 2,
            translateY: (parentHeight - height) / 2
          })));
        });
      },
      keydown: function keydown(event) {
        var options = this.options;

        if (!options.keyboard) {
          return;
        }

        var keyCode = event.keyCode || event.which || event.charCode;

        switch (keyCode) {
          // Enter
          case 13:
            if (this.viewer.contains(event.target)) {
              this.click(event);
            }

            break;
        }

        if (!this.fulled) {
          return;
        }

        switch (keyCode) {
          // Escape
          case 27:
            if (this.played) {
              this.stop();
            } else if (options.inline) {
              if (this.fulled) {
                this.exit();
              }
            } else {
              this.hide();
            }

            break;
          // Space

          case 32:
            if (this.played) {
              this.stop();
            }

            break;
          // ArrowLeft

          case 37:
            this.prev(options.loop);
            break;
          // ArrowUp

          case 38:
            // Prevent scroll on Firefox
            event.preventDefault(); // Zoom in

            this.zoom(options.zoomRatio, true);
            break;
          // ArrowRight

          case 39:
            this.next(options.loop);
            break;
          // ArrowDown

          case 40:
            // Prevent scroll on Firefox
            event.preventDefault(); // Zoom out

            this.zoom(-options.zoomRatio, true);
            break;
          // Ctrl + 0

          case 48: // Fall through
          // Ctrl + 1
          // eslint-disable-next-line no-fallthrough

          case 49:
            if (event.ctrlKey) {
              event.preventDefault();
              this.toggle();
            }

            break;
        }
      },
      dragstart: function dragstart(event) {
        if (event.target.localName === 'img') {
          event.preventDefault();
        }
      },
      pointerdown: function pointerdown(event) {
        var options = this.options,
            pointers = this.pointers;
        var buttons = event.buttons,
            button = event.button;

        if (!this.viewed || this.showing || this.viewing || this.hiding // Handle mouse event and pointer event and ignore touch event
        || (event.type === 'mousedown' || event.type === 'pointerdown' && event.pointerType === 'mouse') && ( // No primary button (Usually the left button)
        isNumber(buttons) && buttons !== 1 || isNumber(button) && button !== 0 // Open context menu
        || event.ctrlKey)) {
          return;
        } // Prevent default behaviours as page zooming in touch devices.


        event.preventDefault();

        if (event.changedTouches) {
          forEach(event.changedTouches, function (touch) {
            pointers[touch.identifier] = getPointer(touch);
          });
        } else {
          pointers[event.pointerId || 0] = getPointer(event);
        }

        var action = options.movable ? ACTION_MOVE : false;

        if (options.zoomOnTouch && options.zoomable && Object.keys(pointers).length > 1) {
          action = ACTION_ZOOM;
        } else if (options.slideOnTouch && (event.pointerType === 'touch' || event.type === 'touchstart') && this.isSwitchable()) {
          action = ACTION_SWITCH;
        }

        if (options.transition && (action === ACTION_MOVE || action === ACTION_ZOOM)) {
          removeClass(this.image, CLASS_TRANSITION);
        }

        this.action = action;
      },
      pointermove: function pointermove(event) {
        var pointers = this.pointers,
            action = this.action;

        if (!this.viewed || !action) {
          return;
        }

        event.preventDefault();

        if (event.changedTouches) {
          forEach(event.changedTouches, function (touch) {
            assign(pointers[touch.identifier] || {}, getPointer(touch, true));
          });
        } else {
          assign(pointers[event.pointerId || 0] || {}, getPointer(event, true));
        }

        this.change(event);
      },
      pointerup: function pointerup(event) {
        var _this2 = this;

        var options = this.options,
            action = this.action,
            pointers = this.pointers;
        var pointer;

        if (event.changedTouches) {
          forEach(event.changedTouches, function (touch) {
            pointer = pointers[touch.identifier];
            delete pointers[touch.identifier];
          });
        } else {
          pointer = pointers[event.pointerId || 0];
          delete pointers[event.pointerId || 0];
        }

        if (!action) {
          return;
        }

        event.preventDefault();

        if (options.transition && (action === ACTION_MOVE || action === ACTION_ZOOM)) {
          addClass(this.image, CLASS_TRANSITION);
        }

        this.action = false; // Emulate click and double click in touch devices to support backdrop and image zooming (#210).

        if (IS_TOUCH_DEVICE && action !== ACTION_ZOOM && pointer && Date.now() - pointer.timeStamp < 500) {
          clearTimeout(this.clickCanvasTimeout);
          clearTimeout(this.doubleClickImageTimeout);

          if (options.toggleOnDblclick && this.viewed && event.target === this.image) {
            if (this.imageClicked) {
              this.imageClicked = false; // This timeout will be cleared later when a native dblclick event is triggering

              this.doubleClickImageTimeout = setTimeout(function () {
                dispatchEvent(_this2.image, EVENT_DBLCLICK);
              }, 50);
            } else {
              this.imageClicked = true; // The default timing of a double click in Windows is 500 ms

              this.doubleClickImageTimeout = setTimeout(function () {
                _this2.imageClicked = false;
              }, 500);
            }
          } else {
            this.imageClicked = false;

            if (options.backdrop && options.backdrop !== 'static' && event.target === this.canvas) {
              // This timeout will be cleared later when a native click event is triggering
              this.clickCanvasTimeout = setTimeout(function () {
                dispatchEvent(_this2.canvas, EVENT_CLICK);
              }, 50);
            }
          }
        }
      },
      resize: function resize() {
        var _this3 = this;

        if (!this.isShown || this.hiding) {
          return;
        }

        if (this.fulled) {
          this.close();
          this.initBody();
          this.open();
        }

        this.initContainer();
        this.initViewer();
        this.renderViewer();
        this.renderList();

        if (this.viewed) {
          this.initImage(function () {
            _this3.renderImage();
          });
        }

        if (this.played) {
          if (this.options.fullscreen && this.fulled && !(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
            this.stop();
            return;
          }

          forEach(this.player.getElementsByTagName('img'), function (image) {
            addListener(image, EVENT_LOAD, _this3.loadImage.bind(_this3), {
              once: true
            });
            dispatchEvent(image, EVENT_LOAD);
          });
        }
      },
      wheel: function wheel(event) {
        var _this4 = this;

        if (!this.viewed) {
          return;
        }

        event.preventDefault(); // Limit wheel speed to prevent zoom too fast

        if (this.wheeling) {
          return;
        }

        this.wheeling = true;
        setTimeout(function () {
          _this4.wheeling = false;
        }, 50);
        var ratio = Number(this.options.zoomRatio) || 0.1;
        var delta = 1;

        if (event.deltaY) {
          delta = event.deltaY > 0 ? 1 : -1;
        } else if (event.wheelDelta) {
          delta = -event.wheelDelta / 120;
        } else if (event.detail) {
          delta = event.detail > 0 ? 1 : -1;
        }

        this.zoom(-delta * ratio, true, event);
      }
    };

    var methods = {
      /** Show the viewer (only available in modal mode)
       * @param {boolean} [immediate=false] - Indicates if show the viewer immediately or not.
       * @returns {Viewer} this
       */
      show: function show() {
        var immediate = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
        var element = this.element,
            options = this.options;

        if (options.inline || this.showing || this.isShown || this.showing) {
          return this;
        }

        if (!this.ready) {
          this.build();

          if (this.ready) {
            this.show(immediate);
          }

          return this;
        }

        if (isFunction(options.show)) {
          addListener(element, EVENT_SHOW, options.show, {
            once: true
          });
        }

        if (dispatchEvent(element, EVENT_SHOW) === false || !this.ready) {
          return this;
        }

        if (this.hiding) {
          this.transitioning.abort();
        }

        this.showing = true;
        this.open();
        var viewer = this.viewer;
        removeClass(viewer, CLASS_HIDE);
        viewer.setAttribute('role', 'dialog');
        viewer.setAttribute('aria-labelledby', this.title.id);
        viewer.setAttribute('aria-modal', true);
        viewer.removeAttribute('aria-hidden');

        if (options.transition && !immediate) {
          var shown = this.shown.bind(this);
          this.transitioning = {
            abort: function abort() {
              removeListener(viewer, EVENT_TRANSITION_END, shown);
              removeClass(viewer, CLASS_IN);
            }
          };
          addClass(viewer, CLASS_TRANSITION); // Force reflow to enable CSS3 transition

          viewer.initialOffsetWidth = viewer.offsetWidth;
          addListener(viewer, EVENT_TRANSITION_END, shown, {
            once: true
          });
          addClass(viewer, CLASS_IN);
        } else {
          addClass(viewer, CLASS_IN);
          this.shown();
        }

        return this;
      },

      /**
       * Hide the viewer (only available in modal mode)
       * @param {boolean} [immediate=false] - Indicates if hide the viewer immediately or not.
       * @returns {Viewer} this
       */
      hide: function hide() {
        var _this = this;

        var immediate = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
        var element = this.element,
            options = this.options;

        if (options.inline || this.hiding || !(this.isShown || this.showing)) {
          return this;
        }

        if (isFunction(options.hide)) {
          addListener(element, EVENT_HIDE, options.hide, {
            once: true
          });
        }

        if (dispatchEvent(element, EVENT_HIDE) === false) {
          return this;
        }

        if (this.showing) {
          this.transitioning.abort();
        }

        this.hiding = true;

        if (this.played) {
          this.stop();
        } else if (this.viewing) {
          this.viewing.abort();
        }

        var viewer = this.viewer,
            image = this.image;

        var hideImmediately = function hideImmediately() {
          removeClass(viewer, CLASS_IN);

          _this.hidden();
        };

        if (options.transition && !immediate) {
          var onViewerTransitionEnd = function onViewerTransitionEnd(event) {
            // Ignore all propagating `transitionend` events (#275).
            if (event && event.target === viewer) {
              removeListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);

              _this.hidden();
            }
          };

          var onImageTransitionEnd = function onImageTransitionEnd() {
            // In case of show the viewer by `viewer.show(true)` previously (#407).
            if (hasClass(viewer, CLASS_TRANSITION)) {
              addListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);
              removeClass(viewer, CLASS_IN);
            } else {
              hideImmediately();
            }
          };

          this.transitioning = {
            abort: function abort() {
              if (_this.viewed && hasClass(image, CLASS_TRANSITION)) {
                removeListener(image, EVENT_TRANSITION_END, onImageTransitionEnd);
              } else if (hasClass(viewer, CLASS_TRANSITION)) {
                removeListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);
              }
            }
          }; // In case of hiding the viewer when holding on the image (#255),
          // note that the `CLASS_TRANSITION` class will be removed on pointer down.

          if (this.viewed && hasClass(image, CLASS_TRANSITION)) {
            addListener(image, EVENT_TRANSITION_END, onImageTransitionEnd, {
              once: true
            });
            this.zoomTo(0, false, false, true);
          } else {
            onImageTransitionEnd();
          }
        } else {
          hideImmediately();
        }

        return this;
      },

      /**
       * View one of the images with image's index
       * @param {number} index - The index of the image to view.
       * @returns {Viewer} this
       */
      view: function view() {
        var _this2 = this;

        var index = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this.options.initialViewIndex;
        index = Number(index) || 0;

        if (this.hiding || this.played || index < 0 || index >= this.length || this.viewed && index === this.index) {
          return this;
        }

        if (!this.isShown) {
          this.index = index;
          return this.show();
        }

        if (this.viewing) {
          this.viewing.abort();
        }

        var element = this.element,
            options = this.options,
            title = this.title,
            canvas = this.canvas;
        var item = this.items[index];
        var img = item.querySelector('img');
        var url = getData(img, 'originalUrl');
        var alt = img.getAttribute('alt');
        var image = document.createElement('img');
        forEach(options.inheritedAttributes, function (name) {
          var value = img.getAttribute(name);

          if (value !== null) {
            image.setAttribute(name, value);
          }
        });
        image.src = url;
        image.alt = alt;

        if (isFunction(options.view)) {
          addListener(element, EVENT_VIEW, options.view, {
            once: true
          });
        }

        if (dispatchEvent(element, EVENT_VIEW, {
          originalImage: this.images[index],
          index: index,
          image: image
        }) === false || !this.isShown || this.hiding || this.played) {
          return this;
        }

        var activeItem = this.items[this.index];
        removeClass(activeItem, CLASS_ACTIVE);
        activeItem.removeAttribute('aria-selected');
        addClass(item, CLASS_ACTIVE);
        item.setAttribute('aria-selected', true);

        if (options.focus) {
          item.focus();
        }

        this.image = image;
        this.viewed = false;
        this.index = index;
        this.imageData = {};
        addClass(image, CLASS_INVISIBLE);

        if (options.loading) {
          addClass(canvas, CLASS_LOADING);
        }

        canvas.innerHTML = '';
        canvas.appendChild(image); // Center current item

        this.renderList(); // Clear title

        title.innerHTML = ''; // Generate title after viewed

        var onViewed = function onViewed() {
          var imageData = _this2.imageData;
          var render = Array.isArray(options.title) ? options.title[1] : options.title;
          title.innerHTML = escapeHTMLEntities(isFunction(render) ? render.call(_this2, image, imageData) : "".concat(alt, " (").concat(imageData.naturalWidth, " \xD7 ").concat(imageData.naturalHeight, ")"));
        };

        var onLoad;
        addListener(element, EVENT_VIEWED, onViewed, {
          once: true
        });
        this.viewing = {
          abort: function abort() {
            removeListener(element, EVENT_VIEWED, onViewed);

            if (image.complete) {
              if (_this2.imageRendering) {
                _this2.imageRendering.abort();
              } else if (_this2.imageInitializing) {
                _this2.imageInitializing.abort();
              }
            } else {
              // Cancel download to save bandwidth.
              image.src = '';
              removeListener(image, EVENT_LOAD, onLoad);

              if (_this2.timeout) {
                clearTimeout(_this2.timeout);
              }
            }
          }
        };

        if (image.complete) {
          this.load();
        } else {
          addListener(image, EVENT_LOAD, onLoad = this.load.bind(this), {
            once: true
          });

          if (this.timeout) {
            clearTimeout(this.timeout);
          } // Make the image visible if it fails to load within 1s


          this.timeout = setTimeout(function () {
            removeClass(image, CLASS_INVISIBLE);
            _this2.timeout = false;
          }, 1000);
        }

        return this;
      },

      /**
       * View the previous image
       * @param {boolean} [loop=false] - Indicate if view the last one
       * when it is the first one at present.
       * @returns {Viewer} this
       */
      prev: function prev() {
        var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
        var index = this.index - 1;

        if (index < 0) {
          index = loop ? this.length - 1 : 0;
        }

        this.view(index);
        return this;
      },

      /**
       * View the next image
       * @param {boolean} [loop=false] - Indicate if view the first one
       * when it is the last one at present.
       * @returns {Viewer} this
       */
      next: function next() {
        var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
        var maxIndex = this.length - 1;
        var index = this.index + 1;

        if (index > maxIndex) {
          index = loop ? 0 : maxIndex;
        }

        this.view(index);
        return this;
      },

      /**
       * Move the image with relative offsets.
       * @param {number} x - The moving distance in the horizontal direction.
       * @param {number} [y=x] The moving distance in the vertical direction.
       * @returns {Viewer} this
       */
      move: function move(x) {
        var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;
        var imageData = this.imageData;
        this.moveTo(isUndefined(x) ? x : imageData.x + Number(x), isUndefined(y) ? y : imageData.y + Number(y));
        return this;
      },

      /**
       * Move the image to an absolute point.
       * @param {number} x - The new position in the horizontal direction.
       * @param {number} [y=x] - The new position in the vertical direction.
       * @param {Event} [_originalEvent=null] - The original event if any.
       * @returns {Viewer} this
       */
      moveTo: function moveTo(x) {
        var _this3 = this;

        var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;

        var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

        var element = this.element,
            options = this.options,
            imageData = this.imageData;
        x = Number(x);
        y = Number(y);

        if (this.viewed && !this.played && options.movable) {
          var oldX = imageData.x;
          var oldY = imageData.y;
          var changed = false;

          if (isNumber(x)) {
            changed = true;
          } else {
            x = oldX;
          }

          if (isNumber(y)) {
            changed = true;
          } else {
            y = oldY;
          }

          if (changed) {
            if (isFunction(options.move)) {
              addListener(element, EVENT_MOVE, options.move, {
                once: true
              });
            }

            if (dispatchEvent(element, EVENT_MOVE, {
              x: x,
              y: y,
              oldX: oldX,
              oldY: oldY,
              originalEvent: _originalEvent
            }) === false) {
              return this;
            }

            imageData.x = x;
            imageData.y = y;
            imageData.left = x;
            imageData.top = y;
            this.moving = true;
            this.renderImage(function () {
              _this3.moving = false;

              if (isFunction(options.moved)) {
                addListener(element, EVENT_MOVED, options.moved, {
                  once: true
                });
              }

              dispatchEvent(element, EVENT_MOVED, {
                x: x,
                y: y,
                oldX: oldX,
                oldY: oldY,
                originalEvent: _originalEvent
              }, {
                cancelable: false
              });
            });
          }
        }

        return this;
      },

      /**
       * Rotate the image with a relative degree.
       * @param {number} degree - The rotate degree.
       * @returns {Viewer} this
       */
      rotate: function rotate(degree) {
        this.rotateTo((this.imageData.rotate || 0) + Number(degree));
        return this;
      },

      /**
       * Rotate the image to an absolute degree.
       * @param {number} degree - The rotate degree.
       * @returns {Viewer} this
       */
      rotateTo: function rotateTo(degree) {
        var _this4 = this;

        var element = this.element,
            options = this.options,
            imageData = this.imageData;
        degree = Number(degree);

        if (isNumber(degree) && this.viewed && !this.played && options.rotatable) {
          var oldDegree = imageData.rotate;

          if (isFunction(options.rotate)) {
            addListener(element, EVENT_ROTATE, options.rotate, {
              once: true
            });
          }

          if (dispatchEvent(element, EVENT_ROTATE, {
            degree: degree,
            oldDegree: oldDegree
          }) === false) {
            return this;
          }

          imageData.rotate = degree;
          this.rotating = true;
          this.renderImage(function () {
            _this4.rotating = false;

            if (isFunction(options.rotated)) {
              addListener(element, EVENT_ROTATED, options.rotated, {
                once: true
              });
            }

            dispatchEvent(element, EVENT_ROTATED, {
              degree: degree,
              oldDegree: oldDegree
            }, {
              cancelable: false
            });
          });
        }

        return this;
      },

      /**
       * Scale the image on the x-axis.
       * @param {number} scaleX - The scale ratio on the x-axis.
       * @returns {Viewer} this
       */
      scaleX: function scaleX(_scaleX) {
        this.scale(_scaleX, this.imageData.scaleY);
        return this;
      },

      /**
       * Scale the image on the y-axis.
       * @param {number} scaleY - The scale ratio on the y-axis.
       * @returns {Viewer} this
       */
      scaleY: function scaleY(_scaleY) {
        this.scale(this.imageData.scaleX, _scaleY);
        return this;
      },

      /**
       * Scale the image.
       * @param {number} scaleX - The scale ratio on the x-axis.
       * @param {number} [scaleY=scaleX] - The scale ratio on the y-axis.
       * @returns {Viewer} this
       */
      scale: function scale(scaleX) {
        var _this5 = this;

        var scaleY = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : scaleX;
        var element = this.element,
            options = this.options,
            imageData = this.imageData;
        scaleX = Number(scaleX);
        scaleY = Number(scaleY);

        if (this.viewed && !this.played && options.scalable) {
          var oldScaleX = imageData.scaleX;
          var oldScaleY = imageData.scaleY;
          var changed = false;

          if (isNumber(scaleX)) {
            changed = true;
          } else {
            scaleX = oldScaleX;
          }

          if (isNumber(scaleY)) {
            changed = true;
          } else {
            scaleY = oldScaleY;
          }

          if (changed) {
            if (isFunction(options.scale)) {
              addListener(element, EVENT_SCALE, options.scale, {
                once: true
              });
            }

            if (dispatchEvent(element, EVENT_SCALE, {
              scaleX: scaleX,
              scaleY: scaleY,
              oldScaleX: oldScaleX,
              oldScaleY: oldScaleY
            }) === false) {
              return this;
            }

            imageData.scaleX = scaleX;
            imageData.scaleY = scaleY;
            this.scaling = true;
            this.renderImage(function () {
              _this5.scaling = false;

              if (isFunction(options.scaled)) {
                addListener(element, EVENT_SCALED, options.scaled, {
                  once: true
                });
              }

              dispatchEvent(element, EVENT_SCALED, {
                scaleX: scaleX,
                scaleY: scaleY,
                oldScaleX: oldScaleX,
                oldScaleY: oldScaleY
              }, {
                cancelable: false
              });
            });
          }
        }

        return this;
      },

      /**
       * Zoom the image with a relative ratio.
       * @param {number} ratio - The target ratio.
       * @param {boolean} [hasTooltip=false] - Indicates if it has a tooltip or not.
       * @param {Event} [_originalEvent=null] - The original event if any.
       * @returns {Viewer} this
       */
      zoom: function zoom(ratio) {
        var hasTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;

        var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

        var imageData = this.imageData;
        ratio = Number(ratio);

        if (ratio < 0) {
          ratio = 1 / (1 - ratio);
        } else {
          ratio = 1 + ratio;
        }

        this.zoomTo(imageData.width * ratio / imageData.naturalWidth, hasTooltip, _originalEvent);
        return this;
      },

      /**
       * Zoom the image to an absolute ratio.
       * @param {number} ratio - The target ratio.
       * @param {boolean} [hasTooltip=false] - Indicates if it has a tooltip or not.
       * @param {Event} [_originalEvent=null] - The original event if any.
       * @param {Event} [_zoomable=false] - Indicates if the current zoom is available or not.
       * @returns {Viewer} this
       */
      zoomTo: function zoomTo(ratio) {
        var _this6 = this;

        var hasTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;

        var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

        var _zoomable = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;

        var element = this.element,
            options = this.options,
            pointers = this.pointers,
            imageData = this.imageData;
        var x = imageData.x,
            y = imageData.y,
            width = imageData.width,
            height = imageData.height,
            naturalWidth = imageData.naturalWidth,
            naturalHeight = imageData.naturalHeight;
        ratio = Math.max(0, ratio);

        if (isNumber(ratio) && this.viewed && !this.played && (_zoomable || options.zoomable)) {
          if (!_zoomable) {
            var minZoomRatio = Math.max(0.01, options.minZoomRatio);
            var maxZoomRatio = Math.min(100, options.maxZoomRatio);
            ratio = Math.min(Math.max(ratio, minZoomRatio), maxZoomRatio);
          }

          if (_originalEvent && options.zoomRatio >= 0.055 && ratio > 0.95 && ratio < 1.05) {
            ratio = 1;
          }

          var newWidth = naturalWidth * ratio;
          var newHeight = naturalHeight * ratio;
          var offsetWidth = newWidth - width;
          var offsetHeight = newHeight - height;
          var oldRatio = width / naturalWidth;

          if (isFunction(options.zoom)) {
            addListener(element, EVENT_ZOOM, options.zoom, {
              once: true
            });
          }

          if (dispatchEvent(element, EVENT_ZOOM, {
            ratio: ratio,
            oldRatio: oldRatio,
            originalEvent: _originalEvent
          }) === false) {
            return this;
          }

          this.zooming = true;

          if (_originalEvent) {
            var offset = getOffset(this.viewer);
            var center = pointers && Object.keys(pointers).length ? getPointersCenter(pointers) : {
              pageX: _originalEvent.pageX,
              pageY: _originalEvent.pageY
            }; // Zoom from the triggering point of the event

            imageData.x -= offsetWidth * ((center.pageX - offset.left - x) / width);
            imageData.y -= offsetHeight * ((center.pageY - offset.top - y) / height);
          } else {
            // Zoom from the center of the image
            imageData.x -= offsetWidth / 2;
            imageData.y -= offsetHeight / 2;
          }

          imageData.left = imageData.x;
          imageData.top = imageData.y;
          imageData.width = newWidth;
          imageData.height = newHeight;
          imageData.ratio = ratio;
          this.renderImage(function () {
            _this6.zooming = false;

            if (isFunction(options.zoomed)) {
              addListener(element, EVENT_ZOOMED, options.zoomed, {
                once: true
              });
            }

            dispatchEvent(element, EVENT_ZOOMED, {
              ratio: ratio,
              oldRatio: oldRatio,
              originalEvent: _originalEvent
            }, {
              cancelable: false
            });
          });

          if (hasTooltip) {
            this.tooltip();
          }
        }

        return this;
      },

      /**
       * Play the images
       * @param {boolean} [fullscreen=false] - Indicate if request fullscreen or not.
       * @returns {Viewer} this
       */
      play: function play() {
        var _this7 = this;

        var fullscreen = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;

        if (!this.isShown || this.played) {
          return this;
        }

        var element = this.element,
            options = this.options;

        if (isFunction(options.play)) {
          addListener(element, EVENT_PLAY, options.play, {
            once: true
          });
        }

        if (dispatchEvent(element, EVENT_PLAY) === false) {
          return this;
        }

        var player = this.player;
        var onLoad = this.loadImage.bind(this);
        var list = [];
        var total = 0;
        var index = 0;
        this.played = true;
        this.onLoadWhenPlay = onLoad;

        if (fullscreen) {
          this.requestFullscreen();
        }

        addClass(player, CLASS_SHOW);
        forEach(this.items, function (item, i) {
          var img = item.querySelector('img');
          var image = document.createElement('img');
          image.src = getData(img, 'originalUrl');
          image.alt = img.getAttribute('alt');
          image.referrerPolicy = img.referrerPolicy;
          total += 1;
          addClass(image, CLASS_FADE);
          toggleClass(image, CLASS_TRANSITION, options.transition);

          if (hasClass(item, CLASS_ACTIVE)) {
            addClass(image, CLASS_IN);
            index = i;
          }

          list.push(image);
          addListener(image, EVENT_LOAD, onLoad, {
            once: true
          });
          player.appendChild(image);
        });

        if (isNumber(options.interval) && options.interval > 0) {
          var play = function play() {
            _this7.playing = setTimeout(function () {
              removeClass(list[index], CLASS_IN);
              index += 1;
              index = index < total ? index : 0;
              addClass(list[index], CLASS_IN);
              play();
            }, options.interval);
          };

          if (total > 1) {
            play();
          }
        }

        return this;
      },
      // Stop play
      stop: function stop() {
        var _this8 = this;

        if (!this.played) {
          return this;
        }

        var element = this.element,
            options = this.options;

        if (isFunction(options.stop)) {
          addListener(element, EVENT_STOP, options.stop, {
            once: true
          });
        }

        if (dispatchEvent(element, EVENT_STOP) === false) {
          return this;
        }

        var player = this.player;
        this.played = false;
        clearTimeout(this.playing);
        forEach(player.getElementsByTagName('img'), function (image) {
          removeListener(image, EVENT_LOAD, _this8.onLoadWhenPlay);
        });
        removeClass(player, CLASS_SHOW);
        player.innerHTML = '';
        this.exitFullscreen();
        return this;
      },
      // Enter modal mode (only available in inline mode)
      full: function full() {
        var _this9 = this;

        var options = this.options,
            viewer = this.viewer,
            image = this.image,
            list = this.list;

        if (!this.isShown || this.played || this.fulled || !options.inline) {
          return this;
        }

        this.fulled = true;
        this.open();
        addClass(this.button, CLASS_FULLSCREEN_EXIT);

        if (options.transition) {
          removeClass(list, CLASS_TRANSITION);

          if (this.viewed) {
            removeClass(image, CLASS_TRANSITION);
          }
        }

        addClass(viewer, CLASS_FIXED);
        viewer.setAttribute('role', 'dialog');
        viewer.setAttribute('aria-labelledby', this.title.id);
        viewer.setAttribute('aria-modal', true);
        viewer.removeAttribute('style');
        setStyle(viewer, {
          zIndex: options.zIndex
        });

        if (options.focus) {
          this.enforceFocus();
        }

        this.initContainer();
        this.viewerData = assign({}, this.containerData);
        this.renderList();

        if (this.viewed) {
          this.initImage(function () {
            _this9.renderImage(function () {
              if (options.transition) {
                setTimeout(function () {
                  addClass(image, CLASS_TRANSITION);
                  addClass(list, CLASS_TRANSITION);
                }, 0);
              }
            });
          });
        }

        return this;
      },
      // Exit modal mode (only available in inline mode)
      exit: function exit() {
        var _this10 = this;

        var options = this.options,
            viewer = this.viewer,
            image = this.image,
            list = this.list;

        if (!this.isShown || this.played || !this.fulled || !options.inline) {
          return this;
        }

        this.fulled = false;
        this.close();
        removeClass(this.button, CLASS_FULLSCREEN_EXIT);

        if (options.transition) {
          removeClass(list, CLASS_TRANSITION);

          if (this.viewed) {
            removeClass(image, CLASS_TRANSITION);
          }
        }

        if (options.focus) {
          this.clearEnforceFocus();
        }

        viewer.removeAttribute('role');
        viewer.removeAttribute('aria-labelledby');
        viewer.removeAttribute('aria-modal');
        removeClass(viewer, CLASS_FIXED);
        setStyle(viewer, {
          zIndex: options.zIndexInline
        });
        this.viewerData = assign({}, this.parentData);
        this.renderViewer();
        this.renderList();

        if (this.viewed) {
          this.initImage(function () {
            _this10.renderImage(function () {
              if (options.transition) {
                setTimeout(function () {
                  addClass(image, CLASS_TRANSITION);
                  addClass(list, CLASS_TRANSITION);
                }, 0);
              }
            });
          });
        }

        return this;
      },
      // Show the current ratio of the image with percentage
      tooltip: function tooltip() {
        var _this11 = this;

        var options = this.options,
            tooltipBox = this.tooltipBox,
            imageData = this.imageData;

        if (!this.viewed || this.played || !options.tooltip) {
          return this;
        }

        tooltipBox.textContent = "".concat(Math.round(imageData.ratio * 100), "%");

        if (!this.tooltipping) {
          if (options.transition) {
            if (this.fading) {
              dispatchEvent(tooltipBox, EVENT_TRANSITION_END);
            }

            addClass(tooltipBox, CLASS_SHOW);
            addClass(tooltipBox, CLASS_FADE);
            addClass(tooltipBox, CLASS_TRANSITION);
            tooltipBox.removeAttribute('aria-hidden'); // Force reflow to enable CSS3 transition

            tooltipBox.initialOffsetWidth = tooltipBox.offsetWidth;
            addClass(tooltipBox, CLASS_IN);
          } else {
            addClass(tooltipBox, CLASS_SHOW);
            tooltipBox.removeAttribute('aria-hidden');
          }
        } else {
          clearTimeout(this.tooltipping);
        }

        this.tooltipping = setTimeout(function () {
          if (options.transition) {
            addListener(tooltipBox, EVENT_TRANSITION_END, function () {
              removeClass(tooltipBox, CLASS_SHOW);
              removeClass(tooltipBox, CLASS_FADE);
              removeClass(tooltipBox, CLASS_TRANSITION);
              tooltipBox.setAttribute('aria-hidden', true);
              _this11.fading = false;
            }, {
              once: true
            });
            removeClass(tooltipBox, CLASS_IN);
            _this11.fading = true;
          } else {
            removeClass(tooltipBox, CLASS_SHOW);
            tooltipBox.setAttribute('aria-hidden', true);
          }

          _this11.tooltipping = false;
        }, 1000);
        return this;
      },
      // Toggle the image size between its natural size and initial size
      toggle: function toggle() {
        if (this.imageData.ratio === 1) {
          this.zoomTo(this.initialImageData.ratio, true);
        } else {
          this.zoomTo(1, true);
        }

        return this;
      },
      // Reset the image to its initial state
      reset: function reset() {
        if (this.viewed && !this.played) {
          this.imageData = assign({}, this.initialImageData);
          this.renderImage();
        }

        return this;
      },
      // Update viewer when images changed
      update: function update() {
        var _this12 = this;

        var element = this.element,
            options = this.options,
            isImg = this.isImg; // Destroy viewer if the target image was deleted

        if (isImg && !element.parentNode) {
          return this.destroy();
        }

        var images = [];
        forEach(isImg ? [element] : element.querySelectorAll('img'), function (image) {
          if (isFunction(options.filter)) {
            if (options.filter.call(_this12, image)) {
              images.push(image);
            }
          } else if (_this12.getImageURL(image)) {
            images.push(image);
          }
        });

        if (!images.length) {
          return this;
        }

        this.images = images;
        this.length = images.length;

        if (this.ready) {
          var changedIndexes = [];
          forEach(this.items, function (item, i) {
            var img = item.querySelector('img');
            var image = images[i];

            if (image && img) {
              if (image.src !== img.src // Title changed (#408)
              || image.alt !== img.alt) {
                changedIndexes.push(i);
              }
            } else {
              changedIndexes.push(i);
            }
          });
          setStyle(this.list, {
            width: 'auto'
          });
          this.initList();

          if (this.isShown) {
            if (this.length) {
              if (this.viewed) {
                var changedIndex = changedIndexes.indexOf(this.index);

                if (changedIndex >= 0) {
                  this.viewed = false;
                  this.view(Math.max(Math.min(this.index - changedIndex, this.length - 1), 0));
                } else {
                  var activeItem = this.items[this.index]; // Reactivate the current viewing item after reset the list.

                  addClass(activeItem, CLASS_ACTIVE);
                  activeItem.setAttribute('aria-selected', true);
                }
              }
            } else {
              this.image = null;
              this.viewed = false;
              this.index = 0;
              this.imageData = {};
              this.canvas.innerHTML = '';
              this.title.innerHTML = '';
            }
          }
        } else {
          this.build();
        }

        return this;
      },
      // Destroy the viewer
      destroy: function destroy() {
        var element = this.element,
            options = this.options;

        if (!element[NAMESPACE]) {
          return this;
        }

        this.destroyed = true;

        if (this.ready) {
          if (this.played) {
            this.stop();
          }

          if (options.inline) {
            if (this.fulled) {
              this.exit();
            }

            this.unbind();
          } else if (this.isShown) {
            if (this.viewing) {
              if (this.imageRendering) {
                this.imageRendering.abort();
              } else if (this.imageInitializing) {
                this.imageInitializing.abort();
              }
            }

            if (this.hiding) {
              this.transitioning.abort();
            }

            this.hidden();
          } else if (this.showing) {
            this.transitioning.abort();
            this.hidden();
          }

          this.ready = false;
          this.viewer.parentNode.removeChild(this.viewer);
        } else if (options.inline) {
          if (this.delaying) {
            this.delaying.abort();
          } else if (this.initializing) {
            this.initializing.abort();
          }
        }

        if (!options.inline) {
          removeListener(element, EVENT_CLICK, this.onStart);
        }

        element[NAMESPACE] = undefined;
        return this;
      }
    };

    var others = {
      getImageURL: function getImageURL(image) {
        var url = this.options.url;

        if (isString(url)) {
          url = image.getAttribute(url);
        } else if (isFunction(url)) {
          url = url.call(this, image);
        } else {
          url = '';
        }

        return url;
      },
      enforceFocus: function enforceFocus() {
        var _this = this;

        this.clearEnforceFocus();
        addListener(document, EVENT_FOCUSIN, this.onFocusin = function (_ref) {
          var target = _ref.target;
          var viewer = _this.viewer;

          if (target !== document && target !== viewer && !viewer.contains(target)) {
            viewer.focus();
          }
        });
      },
      clearEnforceFocus: function clearEnforceFocus() {
        if (this.onFocusin) {
          removeListener(document, EVENT_FOCUSIN, this.onFocusin);
          this.onFocusin = null;
        }
      },
      open: function open() {
        var body = this.body;
        addClass(body, CLASS_OPEN);
        body.style.paddingRight = "".concat(this.scrollbarWidth + (parseFloat(this.initialBodyComputedPaddingRight) || 0), "px");
      },
      close: function close() {
        var body = this.body;
        removeClass(body, CLASS_OPEN);
        body.style.paddingRight = this.initialBodyPaddingRight;
      },
      shown: function shown() {
        var element = this.element,
            options = this.options,
            viewer = this.viewer;
        this.fulled = true;
        this.isShown = true;
        this.render();
        this.bind();
        this.showing = false;

        if (options.focus) {
          viewer.focus();
          this.enforceFocus();
        }

        if (isFunction(options.shown)) {
          addListener(element, EVENT_SHOWN, options.shown, {
            once: true
          });
        }

        if (dispatchEvent(element, EVENT_SHOWN) === false) {
          return;
        }

        if (this.ready && this.isShown && !this.hiding) {
          this.view(this.index);
        }
      },
      hidden: function hidden() {
        var element = this.element,
            options = this.options,
            viewer = this.viewer;

        if (options.fucus) {
          this.clearEnforceFocus();
        }

        this.fulled = false;
        this.viewed = false;
        this.isShown = false;
        this.close();
        this.unbind();
        addClass(viewer, CLASS_HIDE);
        viewer.removeAttribute('role');
        viewer.removeAttribute('aria-labelledby');
        viewer.removeAttribute('aria-modal');
        viewer.setAttribute('aria-hidden', true);
        this.resetList();
        this.resetImage();
        this.hiding = false;

        if (!this.destroyed) {
          if (isFunction(options.hidden)) {
            addListener(element, EVENT_HIDDEN, options.hidden, {
              once: true
            });
          }

          dispatchEvent(element, EVENT_HIDDEN, null, {
            cancelable: false
          });
        }
      },
      requestFullscreen: function requestFullscreen() {
        var document = this.element.ownerDocument;

        if (this.fulled && !(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
          var documentElement = document.documentElement; // Element.requestFullscreen()

          if (documentElement.requestFullscreen) {
            documentElement.requestFullscreen();
          } else if (documentElement.webkitRequestFullscreen) {
            documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
          } else if (documentElement.mozRequestFullScreen) {
            documentElement.mozRequestFullScreen();
          } else if (documentElement.msRequestFullscreen) {
            documentElement.msRequestFullscreen();
          }
        }
      },
      exitFullscreen: function exitFullscreen() {
        var document = this.element.ownerDocument;

        if (this.fulled && (document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
          // Document.exitFullscreen()
          if (document.exitFullscreen) {
            document.exitFullscreen();
          } else if (document.webkitExitFullscreen) {
            document.webkitExitFullscreen();
          } else if (document.mozCancelFullScreen) {
            document.mozCancelFullScreen();
          } else if (document.msExitFullscreen) {
            document.msExitFullscreen();
          }
        }
      },
      change: function change(event) {
        var options = this.options,
            pointers = this.pointers;
        var pointer = pointers[Object.keys(pointers)[0]]; // In the case of the `pointers` object is empty (#421)

        if (!pointer) {
          return;
        }

        var offsetX = pointer.endX - pointer.startX;
        var offsetY = pointer.endY - pointer.startY;

        switch (this.action) {
          // Move the current image
          case ACTION_MOVE:
            this.move(offsetX, offsetY, event);
            break;
          // Zoom the current image

          case ACTION_ZOOM:
            this.zoom(getMaxZoomRatio(pointers), false, event);
            break;

          case ACTION_SWITCH:
            {
              this.action = 'switched';
              var absoluteOffsetX = Math.abs(offsetX);

              if (absoluteOffsetX > 1 && absoluteOffsetX > Math.abs(offsetY)) {
                // Empty `pointers` as `touchend` event will not be fired after swiped in iOS browsers.
                this.pointers = {};

                if (offsetX > 1) {
                  this.prev(options.loop);
                } else if (offsetX < -1) {
                  this.next(options.loop);
                }
              }

              break;
            }
        } // Override


        forEach(pointers, function (p) {
          p.startX = p.endX;
          p.startY = p.endY;
        });
      },
      isSwitchable: function isSwitchable() {
        var imageData = this.imageData,
            viewerData = this.viewerData;
        return this.length > 1 && imageData.x >= 0 && imageData.y >= 0 && imageData.width <= viewerData.width && imageData.height <= viewerData.height;
      }
    };

    var AnotherViewer = WINDOW.Viewer;

    var getUniqueID = function (id) {
      return function () {
        id += 1;
        return id;
      };
    }(-1);

    var Viewer = /*#__PURE__*/function () {
      /**
       * Create a new Viewer.
       * @param {Element} element - The target element for viewing.
       * @param {Object} [options={}] - The configuration options.
       */
      function Viewer(element) {
        var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

        _classCallCheck(this, Viewer);

        if (!element || element.nodeType !== 1) {
          throw new Error('The first argument is required and must be an element.');
        }

        this.element = element;
        this.options = assign({}, DEFAULTS, isPlainObject(options) && options);
        this.action = false;
        this.fading = false;
        this.fulled = false;
        this.hiding = false;
        this.imageClicked = false;
        this.imageData = {};
        this.index = this.options.initialViewIndex;
        this.isImg = false;
        this.isShown = false;
        this.length = 0;
        this.moving = false;
        this.played = false;
        this.playing = false;
        this.pointers = {};
        this.ready = false;
        this.rotating = false;
        this.scaling = false;
        this.showing = false;
        this.timeout = false;
        this.tooltipping = false;
        this.viewed = false;
        this.viewing = false;
        this.wheeling = false;
        this.zooming = false;
        this.id = getUniqueID();
        this.init();
      }

      _createClass(Viewer, [{
        key: "init",
        value: function init() {
          var _this = this;

          var element = this.element,
              options = this.options;

          if (element[NAMESPACE]) {
            return;
          }

          element[NAMESPACE] = this; // The `focus` option requires the `keyboard` option set to `true`.

          if (options.focus && !options.keyboard) {
            options.focus = false;
          }

          var isImg = element.localName === 'img';
          var images = [];
          forEach(isImg ? [element] : element.querySelectorAll('img'), function (image) {
            if (isFunction(options.filter)) {
              if (options.filter.call(_this, image)) {
                images.push(image);
              }
            } else if (_this.getImageURL(image)) {
              images.push(image);
            }
          });
          this.isImg = isImg;
          this.length = images.length;
          this.images = images;
          this.initBody(); // Override `transition` option if it is not supported

          if (isUndefined(document.createElement(NAMESPACE).style.transition)) {
            options.transition = false;
          }

          if (options.inline) {
            var count = 0;

            var progress = function progress() {
              count += 1;

              if (count === _this.length) {
                var timeout;
                _this.initializing = false;
                _this.delaying = {
                  abort: function abort() {
                    clearTimeout(timeout);
                  }
                }; // build asynchronously to keep `this.viewer` is accessible in `ready` event handler.

                timeout = setTimeout(function () {
                  _this.delaying = false;

                  _this.build();
                }, 0);
              }
            };

            this.initializing = {
              abort: function abort() {
                forEach(images, function (image) {
                  if (!image.complete) {
                    removeListener(image, EVENT_LOAD, progress);
                  }
                });
              }
            };
            forEach(images, function (image) {
              if (image.complete) {
                progress();
              } else {
                addListener(image, EVENT_LOAD, progress, {
                  once: true
                });
              }
            });
          } else {
            addListener(element, EVENT_CLICK, this.onStart = function (_ref) {
              var target = _ref.target;

              if (target.localName === 'img' && (!isFunction(options.filter) || options.filter.call(_this, target))) {
                _this.view(_this.images.indexOf(target));
              }
            });
          }
        }
      }, {
        key: "build",
        value: function build() {
          if (this.ready) {
            return;
          }

          var element = this.element,
              options = this.options;
          var parent = element.parentNode;
          var template = document.createElement('div');
          template.innerHTML = TEMPLATE;
          var viewer = template.querySelector(".".concat(NAMESPACE, "-container"));
          var title = viewer.querySelector(".".concat(NAMESPACE, "-title"));
          var toolbar = viewer.querySelector(".".concat(NAMESPACE, "-toolbar"));
          var navbar = viewer.querySelector(".".concat(NAMESPACE, "-navbar"));
          var button = viewer.querySelector(".".concat(NAMESPACE, "-button"));
          var canvas = viewer.querySelector(".".concat(NAMESPACE, "-canvas"));
          this.parent = parent;
          this.viewer = viewer;
          this.title = title;
          this.toolbar = toolbar;
          this.navbar = navbar;
          this.button = button;
          this.canvas = canvas;
          this.footer = viewer.querySelector(".".concat(NAMESPACE, "-footer"));
          this.tooltipBox = viewer.querySelector(".".concat(NAMESPACE, "-tooltip"));
          this.player = viewer.querySelector(".".concat(NAMESPACE, "-player"));
          this.list = viewer.querySelector(".".concat(NAMESPACE, "-list"));
          viewer.id = "".concat(NAMESPACE).concat(this.id);
          title.id = "".concat(NAMESPACE, "Title").concat(this.id);
          addClass(title, !options.title ? CLASS_HIDE : getResponsiveClass(Array.isArray(options.title) ? options.title[0] : options.title));
          addClass(navbar, !options.navbar ? CLASS_HIDE : getResponsiveClass(options.navbar));
          toggleClass(button, CLASS_HIDE, !options.button);

          if (options.keyboard) {
            button.setAttribute('tabindex', 0);
          }

          if (options.backdrop) {
            addClass(viewer, "".concat(NAMESPACE, "-backdrop"));

            if (!options.inline && options.backdrop !== 'static') {
              setData(canvas, DATA_ACTION, 'hide');
            }
          }

          if (isString(options.className) && options.className) {
            // In case there are multiple class names
            options.className.split(REGEXP_SPACES).forEach(function (className) {
              addClass(viewer, className);
            });
          }

          if (options.toolbar) {
            var list = document.createElement('ul');
            var custom = isPlainObject(options.toolbar);
            var zoomButtons = BUTTONS.slice(0, 3);
            var rotateButtons = BUTTONS.slice(7, 9);
            var scaleButtons = BUTTONS.slice(9);

            if (!custom) {
              addClass(toolbar, getResponsiveClass(options.toolbar));
            }

            forEach(custom ? options.toolbar : BUTTONS, function (value, index) {
              var deep = custom && isPlainObject(value);
              var name = custom ? hyphenate(index) : value;
              var show = deep && !isUndefined(value.show) ? value.show : value;

              if (!show || !options.zoomable && zoomButtons.indexOf(name) !== -1 || !options.rotatable && rotateButtons.indexOf(name) !== -1 || !options.scalable && scaleButtons.indexOf(name) !== -1) {
                return;
              }

              var size = deep && !isUndefined(value.size) ? value.size : value;
              var click = deep && !isUndefined(value.click) ? value.click : value;
              var item = document.createElement('li');

              if (options.keyboard) {
                item.setAttribute('tabindex', 0);
              }

              item.setAttribute('role', 'button');
              addClass(item, "".concat(NAMESPACE, "-").concat(name));

              if (!isFunction(click)) {
                setData(item, DATA_ACTION, name);
              }

              if (isNumber(show)) {
                addClass(item, getResponsiveClass(show));
              }

              if (['small', 'large'].indexOf(size) !== -1) {
                addClass(item, "".concat(NAMESPACE, "-").concat(size));
              } else if (name === 'play') {
                addClass(item, "".concat(NAMESPACE, "-large"));
              }

              if (isFunction(click)) {
                addListener(item, EVENT_CLICK, click);
              }

              list.appendChild(item);
            });
            toolbar.appendChild(list);
          } else {
            addClass(toolbar, CLASS_HIDE);
          }

          if (!options.rotatable) {
            var rotates = toolbar.querySelectorAll('li[class*="rotate"]');
            addClass(rotates, CLASS_INVISIBLE);
            forEach(rotates, function (rotate) {
              toolbar.appendChild(rotate);
            });
          }

          if (options.inline) {
            addClass(button, CLASS_FULLSCREEN);
            setStyle(viewer, {
              zIndex: options.zIndexInline
            });

            if (window.getComputedStyle(parent).position === 'static') {
              setStyle(parent, {
                position: 'relative'
              });
            }

            parent.insertBefore(viewer, element.nextSibling);
          } else {
            addClass(button, CLASS_CLOSE);
            addClass(viewer, CLASS_FIXED);
            addClass(viewer, CLASS_FADE);
            addClass(viewer, CLASS_HIDE);
            setStyle(viewer, {
              zIndex: options.zIndex
            });
            var container = options.container;

            if (isString(container)) {
              container = element.ownerDocument.querySelector(container);
            }

            if (!container) {
              container = this.body;
            }

            container.appendChild(viewer);
          }

          if (options.inline) {
            this.render();
            this.bind();
            this.isShown = true;
          }

          this.ready = true;

          if (isFunction(options.ready)) {
            addListener(element, EVENT_READY, options.ready, {
              once: true
            });
          }

          if (dispatchEvent(element, EVENT_READY) === false) {
            this.ready = false;
            return;
          }

          if (this.ready && options.inline) {
            this.view(this.index);
          }
        }
        /**
         * Get the no conflict viewer class.
         * @returns {Viewer} The viewer class.
         */

      }], [{
        key: "noConflict",
        value: function noConflict() {
          window.Viewer = AnotherViewer;
          return Viewer;
        }
        /**
         * Change the default options.
         * @param {Object} options - The new default options.
         */

      }, {
        key: "setDefaults",
        value: function setDefaults(options) {
          assign(DEFAULTS, isPlainObject(options) && options);
        }
      }]);

      return Viewer;
    }();

    assign(Viewer.prototype, render, events, handlers, methods, others);

    return Viewer;

  })));